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Hello, I 've read this paper: Beherens et al, Neuroimage 2007,34:144-55 "we examin each fibre population to confirm that the volume fraction has not been forced to zero by automatic relevance determination (we threshold at 0.05)." Program(xfibres.cc) is written as "nfibs=0; if((m_sum_f[f]/m_nsamples>0.05)) nfibs++; ... m_beenhere = nfibs " But, mean_f2samples contains <0.05. What is the meaning of "we threshold at 0.05" ? And m_beenhere is used by "bool neighbour_initialise". I donot understand "bool neighbour_initialise" well. I assume (possibly incorrectly) that it decides whether to execute "initialise_tensor". Many thanks for your help.